Reference no: EM131512557

1. A clinical trial is run to evaluate the effectiveness of a new drug to prevent preterm delivery. A total of n=250 pregnant women agree to participate and are randomly assigned to receive either the new drug or a placebo and followed through the course of pregnancy. Among 125 women receiving the new drug, 24 deliver preterm and among 125 women receiving the placebo, 38 deliver preterm. Construct a 95% confidence interval for the difference in proportions of women who deliver preterm

2. clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug considered standard care and to placebo. Pregnant women are enrolled and randomly assigned to receive either the experimental drug, the standard drug or placebo. Women are followed through delivery and classified as delivering preterm (< 37 weeks) or not. The data are shown below.

Preterm Delivery	Experimental Drug	Standard Drug	Placebo
Yes	17	23	35
No	83	77	65

Using this data, generate a 95% confidence interval for the difference in proportions of women delivering preterm in the experimental and standard drug treatment groups

3. The following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in lowering total serum cholesterol. Generate a 95% confidence interval for the proportion of all patients with total cholesterol < 200.

	New Drug (n=75)	Placebo (n=75)	Total Sample (n=150)
Mean (SD) Total Serum Cholesterol	185.0 (24.5)	204.3 (21.8)	194.7 (23.2)
% Patients with Total Cholesterol < 200	78.0%	65.0%	71.5%

4. A study is run comparing HDL cholesterol levels between men who exercise regularly and those who do not. The data are shown below.

Regular Exercise	N	Mean	Std Dev
Yes	35	48.5	12.5
No	120	56.9	11.9

Generate a 95% confidence interval for the difference in mean HDL levels between men who exercise regularly and those who do not.

5. The following table shows the distribution of BMI in children living in US and European urban neighborhoods. (The data are in millions.)

Neighborhood	Normal Weight	Overweight	Obese
US	125	50	40
Europe	101	42	21

What proportion of children living in a US urban neighborhood is overweight?

6. The following table shows the distribution of BMI in children living in US and European urban neighborhoods. (The data are in millions.)

Neighborhood	Normal Weight	Overweight	Obese
US	125	50	40
Europe	101	42	21

What proportion of children is overweight?

7. The following table shows the numbers of patients classified as underweight, normal weight, overweight and obese according to their diabetes status.

	Underweight	Normal Weight	Overweight	Obese
Diabetes	8	34	65	43
No Diabetes	12	85	93	40

What proportion of patients is overweight?

8. What is the best type of graph to display the following data?

Gender	Cigarettes per day
Female	45
Male	20
Female	30
Female	40
Male	90
Male	50
Male	20
Male	23
Female	9

9. What is the best type of graph to display the following data?

Duration of hospital stay:

5, 10, 6, 11, 5, 14, 30, 11, 17, 3, 9, 3

10. What is the best type of graph to display the following data?

GDP per capita fertility rate

   3432.0224      3.783

   6882.4069      4.026

   678.99817      4.508

   3623.5324      2.338

   5741.2071      1.399

   35477.473       1.43

   47548.688       2.04

   691.36909        2.3

   19858.343       1.45

   39152.308      1.994

   2942.4385      3.221

   14623.479      2.175

   4387.7071      2.436

   84732.957       1.52

   3928.8789      2.546

   1455.1022      2.479

   24646.021      2.644

   3056.1185      2.735